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Frigidaire Range FPEF3077QFJ - Pre-Heat and Convection Baking Oven Temp issue

jimberns

Premium Member
Joined
Nov 8, 2021
Messages
6
Location
Iowa
Model Number
FPEF3077QFJ
Brand
Frigidaire
Age
1-5 years
I have a Frigidaire Range - Model # FPEF3077QFJ.

If I put the oven on PowerPlus Pre-Heat mode and set the temperature to 400°F, the oven only reaches appx. 200°F before the Pre-Heat light goes off - which is supposed to indicate the oven is heated to temp. After that, turning the dial over to Convection Bake mode, the oven only goes to about 250°F.

If I initially start the oven in Bake mode (foregoing the Pre-Heat mode) and set the temp to 400°F, it comes up to the correct temperature.

Any suggestions on why the Pre-Heat and Convection Baking mode aren't coming up to the correct temperature?
 

rickgburton

Appliance Tech - Moderator
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Messages
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Location
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Here's the part you need:
frigidaire-circuit-board-assy-316472807-ap6871886_01_l.jpg
 

jimberns

Premium Member
Joined
Nov 8, 2021
Messages
6
Location
Iowa
2nd Frigidaire Appliance I've had to purchase a new circuit board for since bought new in 2019. Purchased all new Frigidaire appliances (stove, frig, microwave, & dishwasher) for a kitchen remodel. Is this typical with Frigidaire? Waiting for the other two to fail now.........
 

rickgburton

Appliance Tech - Moderator
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Frigidaire is one of the better brands. I wouldn't say it's typical. With all the new electronics and mini-computers in appliances it's more common to replace a PC board than anything else. That goes for all brands and appliances. That being said, yours should have lasted longer. Have you tried explaining this to Frigidaire? You might not get anywhere with them but you won't know until you try. You know what they say, the squeaky wheel gets the grease. LOL
 

jimberns

Premium Member
Joined
Nov 8, 2021
Messages
6
Location
Iowa
I reached out to Frigidaire and had no luck, so I returned to this site and purchased the circuit board by clicking on the link in your 1st response. Received it this weekend and just installed it, but it did not solve the problem. Do you have any other suggestions and can I return the circuit board?
 

rickgburton

Appliance Tech - Moderator
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. Check the bake element for continuity. If the element checks good set the oven to bake and measure the voltage across P7 and L2-OUT (on the K1 bake relay) on the board.
 

jimberns

Premium Member
Joined
Nov 8, 2021
Messages
6
Location
Iowa
Hi Rick,
Sorry it's take so long to get back to you. I decided with Thanksgiving coming up, I didn't want to screw the thing up worse than it already is and have no oven/stove at all, so I left it alone until tonight. Here's what I found.

I have 42 ohms of resistance across the leads of the baking element.

Voltage across the P7 and L2-OUT on the K1 bake relay is 245v when it is on and drops to 1.6mV when it is off. The voltage is the same whether in PowerPlus Preheat mode or Bake mode.

I also measured the length of time that I get voltage across those leads. This is what seems odd.
When the oven is in PowerPlus Preheat mode, I get 245v across those leads for only about 15 seconds. Then it spends about 45 seconds with no voltage across the leads before powering back up again for 15 seconds.
When the oven is in Bake mode, I get 245v across those leads for 50 seconds. Then it turns off for 10 seconds before powering back up again for 50 seconds.
During the 'on' time, I measure 120v across the leads of the heating element.

All of the voltage measurements were taken within a few minutes of turning the oven on.

Since I still have both circuit boards, I conducted these measurements with both boards and got similar results.
 

jimberns

Premium Member
Joined
Nov 8, 2021
Messages
6
Location
Iowa
In the PowerPls Preheat Mode, it will get warm, but not hot. It only gets the oven up to about 200°F in the PowerPlus Preheat Mode before the chime goes off indicating the PreHeat is done. This is when the preferred temp was set to 400°F.

In bake mode, the element will bring the oven up to the correct temp, but not very quickly.

I seldom see the heating element glow orange/red hot like you might expect. Last night during my experimenting, the only time I saw it get orange / redish was when I removed the fan cover as well as the oven door. I put the oven in PowerPlus Preheat and I taped the shut-off switch down so the oven thought the door was closed. The heating element got a dull orange on the sides, but not at the bottom or top. The fan never turned on when I did this. I assume that is because the heat was escaping so the oven and the sensor wasn't telling the fan to circulate the heat. I've attached a photo I took.

When placing the door back on the oven, the heating element never gets hot enough to turn red/orange like this. It always remains dull gray/black.
 

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rickgburton

Appliance Tech - Moderator
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OK Jim, I don't think we're on the same anymore. LoL The convection element is only a 120V element. There's another hidden bake element you need to access from behind the range. Let's start over and I'll try to make it easy for you. The range uses all three elements to maintain the oven temperature in all modes except broil. Set your meter on the lowest ohms scale and check all three elements for continuity. Just like a light bulb, all elements are either good or bad. Meter indicates 0, element is good. Meter indicates 1, element is bad. If the elements check good, check the oven sensor for 1100Ω at room temperature. Set the oven to "Bake". In bake mode the control sends the voltage to the bake element and alternates between the other two so it could be both elements on for x amount of time then just the bake element for x amount of time then just the broil element for x amount of time. The x amount of time changes depending on the selected cycle. Did you get the control from the link above?
 

jimberns

Premium Member
Joined
Nov 8, 2021
Messages
6
Location
Iowa
Hi Rick,
Guess I should read a little closer. :) I think we're on the same page now and I think we're narrowing down the issue.
I don't have an analog multimeter, but below (and in the attached pics) are the resistance readings taken on the various heating elements.
Convection = 42.2 ohms
Broil = 14.6 Ohms
Bake = 16.2 Ohms

I forgot to check the oven sensor at room temp, but when the oven was heated up, it was about 1,700 ohms. I'll check on that tomorrow night at room temp.

Two other things I discovered are the following:
When in Bake mode, the Convection Element always has 120v present. I believe the oven toggles between the Bake Element (appx. 50 sec on / 10 sec off) and the Broiler Element (appx. 10 sec on / 50 sec off). I'm working to borrow another meter (I have two) so I can connect a voltmeter to all three simultaneously to confirm that timing and toggling.

The things I found that I believe may be my problems are:
The 4th photo I've attached is what I believe is the Thermal Fuse. It is not letting voltage pass through to the Broil Element that I noticed and the resistance measures in Megohms. When I put the oven in Broil mode, I would get voltage to the input side of that device, but it wasn't allowing it to pass through. Again, I need to do some additional testing to confirm all of this tomorrow night when I am back home, but that seems to be one of my issues. It was getting late and trying to keep track of what mode I was in and what all I tested got to be mind-boggling.
The other seems to possibly be the fan motor. There were a couple of times last night that I had voltage to the motor, but the fan was not turning. I opened the oven door and poked a shish kabob skewer to give one of the blades a nudge and it started running. It doesn't always do this, but did a couple of times. This may be reaching, but could the fan not running have also caused the thermal fuse to blow?

Does this sound like a plausible cause to my problem?

If yes, could you send me a link to those two parts? In the meantime, I will do some additional testing to confirm all of this and also test the oven sensor.

Lastly, yes, I did purchase the circuit board from the link you provided. I figured you folks were kind enough to run a website like this to help people like me out so you deserve the business. So, if we think the Thermal Fuse and Fan Motor are the issues, I'd like to purchase those and return the circuit board.

Thanks!!
 

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  • Thermal Fuse.jpg
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rickgburton

Appliance Tech - Moderator
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I forgot to check the oven sensor at room temp
You don't need to. No further testing is needed. Replace those two parts and it's fixed.
I'd like to purchase those and return the circuit board.
We don't sell any parts. We just link you to a reputable parts sites. Most of the time it's APP or repairclinic. You'll need to talk to them about returning the board.
 
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